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Unit 2 Saving the Earth,Topic 2 All these problems are very serious Section C,Lets learn!,New Words,.,environment,.,earth,.,hole,.,plant,.,trees,.,moon,.,planets,.,pollution,Lets talk.,.,People have cut down many trees.,.,Cars have polluted air.,.,Factories have polluted the land.,.,Therefore we should protect our environment.,have done的用法,重点句型,1.Tell your friends about what we have learned today. 2.Practice the dialogue with your classmates.,Homework,Thank you!,
